Ceiling fan blowing the same bulb

Hi,

I have a problem that I cannot resolve. We have a ceiling fan in the bedroom that has a 2 bulb light kit on it. The problem I have is one bulb will only last about a week before it blows.

It's always the same socket that blows the bulb. The lights do not flicker and everything looks fine when I first replace the bulb(s). I have tried 2 new bulbs, moving the bulb that did not blow to the bad? socket and putting a new one in the good? socket. No matter what it always blows the bulb in that same socket.